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In case of delta/delta transformer if the one phase is blown
out then what will be secondary line voltage ?
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Answer Posted / shashidhara
If R is blown and YB are on, the voltage output of RY and BR in secondary phase will be 1/2 the rated and BR will be at rated voltage. i.e., the voltage is applied to only middle limb and the other 2 limbs get half voltage as the R line supplying the primary is cut. So if rated sec vg is 220, in secondary, voltages will be as follows:
RY-110
YB-220
BR-110
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